Method of making a carton liner



Aug. 31,1926. 1,597,677 A. c. EVERETT METHOD OF MAKING A CARTON LINER F'iled Nov. 12, 1921 2 Sheets-Sheet l 21/611,271! art/1111' 62?]61'622 Aug. 31 1926. 1,597,677

A. C. EVERETT METHOD OF MAKING A CARTON LINER Filed Nov. 12, 1921 2 Sheets-Sheet 2 7. 115/17 F, /P I aliru'aey a strip of sheet material and folded around Patented Aug. 31, 1926.

' UNITED STTATESTP'ATENT"OFFICE.

antenna 0. EVERETT, on noxnu'nrjmnssaorrusn'r'rs, ASSIGNOR, BY, MESNE AS- srenmnn'rs, '10 srn'rn s'rnsnrrnnsr COMPANY, 'rrws'rnn, or BOSTON, MASSA- cnnsm'rs, A CORPORATION or MASSACHUSETTS.

METHOD or MAKING A oAaroN LINER.

Application filed November. 12, 1921. Serial No. 514,606.

This invention relates to carton liners and the method of preparing the samezfor. insertion into the carton, and particularly to a composite liner consisting of'a sheet 2f paper and a sheet of foil, as tin or lead oil.

The usual carton liner is acne-ply blank which is generally cut from a continuous a forming block corresponding to the car'- ton to .be lined. The overlapping lateral edges of the folded blank are then united together and the forming block, with the liner, folded and sealed thereabout, descends into the carton. The liner is stripped from the forming block and remainswithin the carton upon withdrawal of said block from the carton, after which the lined carton is filled, sealed, and wrapped.

The method of folding, sealing, and inserting the' liner into the cartonis described and illustrated in the Doble and Robinson Patent, No. 1,247,238, issued November 20, 1917, to which reference is made as showing a standard form of machine for this purpose. Q

' The liner has usually been either an ordinarypaper sheet,'or a prepared wax or parafline paper, Where ordinary paper is used, the overlapping edges ,of the olded blank are sealed to each other by gluing. Where a prepared wax or paraifine paper is used, such-overlapping edges are sealed to each other byineltin or softening the wax, so that said edges will firmly adhere when the wax again stiifens' upon cooling.

For certain products, however, a liner of .tin or lead foil has been found to possess many advantages over the usual paper, or

waxed paper liner. The peculiarities characteristic 'ofthe foil itself as regards sealing, have however, prevented the general use of this material as a carton liner.

In the first place, it is not "possible to apply heat to the foil to seal the overlapping edges as in the case of the waxed paper liner, nor can such edges be glued directly to each other, as in the case of the ordinary paper liner, because'of the foil to foil con-. tact at the overlapping edges of the blank. I have discovered that it is possible to combine the superior preservative qualities ofv the foil lining with the glue absorbtive qualities of the ordinary paper lining in a affording a sin 1e. unitary liner which ma bereadily fol ed, sealedand inserted in the carton by such a standard machine as that shown in th Robinson and Doble patent with but slight modification of existing structure.

' I attain this result by the use of a composite liner, consisting of a sheet of paper and a superposed. sheet of foil, which when folded, sealed, and inserted within the carfton,-is disposed with the foil sheet-againstv the carton walls and with the paper sheet exposed to the carton contents. I

According to my invention, heat is applied to bothlongltudinal edges. of the foil sheet at one side of its central median line and through approximately one half of its longerdimension tozremove the foil, preferably atregularly spaced intervals, and thus expose corresponding portions of the outer face of the underlying paper sheet. Glue is applied toboth longitudinal edges of the inner face of the paper sheet at that side 'of its'central median line opposite the treated half of the foil sheet and through approximately one half of its longer dimension. The bands or zones of glue on the paper sheet are in line with the treated bands or zones of the foil sheet so that when the liner is folded for insertion into the carton they will overlap and the glued inner face of the paper sheet will adhere to the portions of the outer face of the paper sheet exposed through the openings in the foil sheet made by melting oil the foil, thus paper-to-paper seal at said overlapping edges. v

' It is, of course, highly lize the existin equipment illustrated in the Dobleand obinsonlpateiit in connection with the composite liner, since these machines not only represent a considerable investmenflbut are in themselves equipment which has'been found to be most satisfacdesirable to utitory in preparing and inserting liners.

with the principles of my invention. The

pecially .with a liner machine of the typeshown in the Doble and Robinson patent.

My invention, therefore, not only consists in the liner itself, but in the method of preparing such liner so that it may be sealed when inserted in the carton.

The particular liner involved herein, together with a preferred method of treating the same, and convenient apparatus for practicin such method, are described and illustrate in the accompanying speclfication and drawings, and the characteristic features of novelty are particularly pointed out in the appended claims. Throughout the specification and drawings like reference characters are correspondingly applied, and in the drawings: Y

Fig. 1 is-a partial side elevation of a machine of the type shown in the Doble and Robinson patent and equipped for the practice of my invention.

Figs. 2, 3 and 4, are side diagrams illustratin g the operation of the foil heating element and adhesive applying roller.

Figs. 2 and 3 are plan diagrams showing such elements in the positions of Figs. 2 and 3, respectively.

'Figs. 5 and 6 are plan views of the liner blank prepared as indicated in Figs. 1 to 4 inclusive and showing respectively the paper and foil faces thereof. 1'

Fig. 7 shows diagrammatically the operation of the reciprocating forming block for folding the prepared liner blank and inserting it in the carton.

Figs. 8, 9 and 10 are side views showing successive phases in the operation of folding the prepared blank and uniting its over lapping edges, and

Figs. 8, 9 and 10" are plan views corresplonding to Figs. 8, 9 and 10, respective Tlih composite liner consists of a foil sheet F and a superposed paper sheet P which are drawn from the supply roll 3 of the machine in the direction of the arrow 4:, Fig. 2, by a pair of superposed oppositely rotating feed rolls 5 and 6 to a transversely disposed cutter O which simultaneously severs the contiguous sheets into liner blanks of prop er dimension (Figs. 5 and 6). i

The blanks are then passed by suitable feed mechanism indicated generally at 7 to a reciprocable forming block 8. The liner is folded about the block 8 by suitable folding mechanism indicated generally at 9 and the overlapping side edges of the blank sealed to each other, whereupon the block with the liner disposed thereabout descends and inserts the liner into the carton 10, which is supported below and in line with the forming block.

The method of treating the composite liner so that it may be sealed consists in applying heat to the foil face F of the liner at definite portions thereof to remove the foil, thereby exposing the outer face of the underlying paper sheet I so that the corresponding portions of the inner face of'the paper sheet may be caused to adhere to said exposed. portions of the outer face of the paper sheet when the liner is folded.

Considering the blank as it appears in Fig. 6, the foil is removed in any suitable way and preferably by heat treatment applied to both longitudinal edges of the foil sheet F at one side of the median line of the sheet, leaving two rows of holes or notches 11 through which the inner face of the underlying paper sheet Pis exposed. Glue is applied in zones or bands 12'adjacent both longitudinal edges of the outer face of the paper sheet at that side ofits central median line opposite to the openings 11 in the foil sheet. The bands of glue 12 are in line with the openings 11 so as sired type and as here shown consists of a movable heater 13 having regularly spaced notches 14 along one edge. The heater .13 encloses an at 15 and is mounted to move into contact with the foil face F of the liner at determined intervals and in properly timed tion to the feed of the liner strip past the heater. A backing 16 for the strip is arranged'opposite the heater 13.

Adhesive is applied to the'outer face of the paper sheet P from a glue roll 17 operating m a glue pct 17' by a glue transfer roll 18 which is pivotally mounted at 19 to rock against the paper face 1? of the liner strip opposite the feed roll 6, said feed roll 6 thus acting as a backing for the strip. The heater and the glue applying roll '18 may operate simultaneously or they may operate at different intervals but the heater is located to contact the liner web preferably at least one blank length in advance rela-.

sheet, and to then swing partly back towards the glue supply roll 17 Fi 3 and 3, while the heater 13 is advance against the foil sheet F of the strip. After the heater has glue 12 will be applied along one-half of the opposite longitudinal edge of the sheet. The roll 18 then swings back to the glue roll 17 (Fig. 4:) to take up a fresh supply of glue (Fig.

While I have shown and described my invention in its adaptation to the lining of cartons, it will be understood that' such showing is purely illustrative and in no way limiting, and that the principles involved are applicable to other uses. For example, the folded and sealed blank itself might be used as a carton, particularl where heavy foil, a lead foil, is used. ndeed my invention is not to be regarded as limited to the use of foil as a combining element with the paper, but contemplates any metallic sheet o metal coated or impregnated material, or other material or coating, which does not afford a good adhering surface for the adhesive in itself, but is capable of being removed by fusion or otherwise to expose the underlyingpaper or other fibrous sheet, and the term foil where used in the specification and claims, is to be construed accordingly. Similarly the term paper as used herein is to be construed a meanin any fibrous sheet material, whether coate or impregnated, to which adhesive -will readily adhere.

Various modifications in the practice of my invention may obviously be resorted to within the limits of the appended claims.

What I therefore claim and desire to-secure by Letters Patent is:

1. The method of preparing a composite liner consisting of afoil sheet and a pa er sheetco-extenslve with said foil sheet, which consist in applying heat to melt out portions of the foil sheet adjacent both longitudinal edges thereof, and on one side of the transverse median line of the sheet to provide openings extending through approximately one half of t e longitudinal extent of the sheet, and through wh1ch openings the underlying portion of the contiguous face of the paper sheet are exposed, and

in applying to the reverse face of the paper sheet adjacent both longitudinal edges there of and in line with the openings of the foil sheet bands of adhesive extending through approximately one half of the longer dimension of the .paper sheet, and on the opposite side of the transverse median line of the sheet, and which hands when the liner is folded, are adapted to contact the paper sheet exposed through said openings to permit a paper-to-paper seal.

2. The method of preparing a composite liner consisting of a foil sheet and a paper sheet co-extenslve with said foil sheet, which consists in applying heat to the foil sheet to melt out a portion thereof to provide a marginal opening through which the underlying portion of the contiguous face of the paper sheet is exposed, and in applying to the reverse face of the paper sheet and in line with the opening of the foil sheet a band'of adhesive which, when the liner is folded, is adapted to contact the portion of the paper sheet exposed through said opening of the foil sheet whereby to permit a paper-to-paper seal.

3. Themethod of preparing a composite liner consistin of a foil sheet and a paper sheet co-extenslve with said foil sheet, which consists in applying heat to the foil sheet longitudinal extent of the sheet to provide an alined series of spaced openings through which the underlying portions of the contiguous face of the paper sheet are exposed, and in applying to the reverse face of the paper sheet adjacent both longitudinal edges thereof and in line with the openings of the foil sheet bands of adhesive extending through approximately one-half of the longer dimension of the paper sheet which adhesive bands, when the liner is folded, are adapted to contact the paper sheet exposed throu h said openings of the foil sheet where y topermit a paper-to-paper seal.

In testimony whereof I affix my signature.

ARTHUR (l. EVERETT. 

